“InTheKnow” Pages                      Useful Equations

Compression Ratio Formula

               GV (Head Gasket Volume) = Bore(in) X Bore(in) X 12.87

                                X (Head Gasket Thickness in Inches)

               DV (Below Deck Volume) = Bore(in) X Bore(in) X 12.87 

                                 X (Inches Below the Deck)

               HV (Head Volume) = CC's

               VV (Dish, Valve Pocket, Dome Volume) = CC's 

                               (Minus for dish or valve pockets, Plus for dome)

               PV (Volume displaced by Piston) = Bore X Bore X Stroke X 12.87

          Compression Ratio = (GV+DV+HV-VV+PV) / (GV+DV+HV-VV)

Cubic Inches = Bore x Bore X Stroke X Number of Cylinders X .7854

Conversions

Convert Cubic Inches to CCs = Cubic Inches X 16.386

Convert Cubic Inches to Liters = Cubic Inches X .016386 

Engine in Liters = (Bore(mm) X Bore(mm) X Stroke(mm)

X Number of Cylinders X 12.87) / (16386 X 1000)

Engine in CCs = (Bore(mm) X Bore(mm) X Stroke(mm)

X Number of Cylinders X 12.87) / 16386

Convert CCs to Cubic Inches = CCs / 16.386

Convert Liters to Cubic Inches = Liters / .016386

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